Drop support for pre 2.2 Linux kernels
This commit is contained in:
Miroslav Lichvar
parent
ec7d302a6c
commit
da1097095c
1 changed files with 42 additions and 86 deletions
128
sys_linux.c
128
sys_linux.c
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@ -881,6 +881,19 @@ guess_hz_and_shift_hz(int tick, int *hz, int *shift_hz)
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return;
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}
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/* ================================================== */
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static int
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kernelvercmp(int major1, int minor1, int patch1,
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int major2, int minor2, int patch2)
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{
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if (major1 != major2)
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return major1 - major2;
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if (minor1 != minor2)
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return minor1 - minor2;
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return patch1 - patch2;
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}
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/* ================================================== */
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/* Compute the scaling to use on any frequency we set, according to
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the vintage of the Linux kernel being used. */
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@ -972,91 +985,35 @@ get_version_specific_details(void)
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version_minor = minor;
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version_patchlevel = patch;
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have_nanopll = 0;
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switch (major) {
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case 1:
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/* Does Linux v1.x even support HZ!=100? */
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switch (minor) {
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case 2:
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if (patch == 13) {
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freq_scale = (hz==100) ? (128.0 / 100.0) : basic_freq_scale ; /* I _think_! */
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have_readonly_adjtime = 1;
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} else {
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LOG_FATAL(LOGF_SysLinux, "Kernel version not supported yet, sorry.");
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}
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break;
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case 3:
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/* I guess the change from the 1.2.x scaling to the 2.0.x
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scaling must have happened during 1.3 development. I
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haven't a clue where though, until someone looks it
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up. */
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LOG_FATAL(LOGF_SysLinux, "Kernel version not supported yet, sorry.");
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break;
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default:
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LOG_FATAL(LOGF_SysLinux, "Kernel version not supported yet, sorry.");
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break;
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}
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break;
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case 2:
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switch (minor) {
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case 0:
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if (patch < 32) {
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freq_scale = (hz==100) ? (128.0 / 125.0) : basic_freq_scale;
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have_readonly_adjtime = 1;
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} else if (patch >= 32) {
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freq_scale = (hz==100) ? (128.0 / 128.125) : basic_freq_scale;
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/* The functionality in kernel/time.c in the kernel source
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was modified with regard to what comes back in the
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txc.offset field on return from adjtimex. If txc.modes
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was ADJ_OFFSET_SINGLESHOT on entry, the outstanding
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adjustment is returned, however the running offset will
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be modified to the passed value. */
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have_readonly_adjtime = 0;
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}
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break;
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case 1:
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/* I know that earlier 2.1 kernels were like 2.0.31, hence
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the settings below. However, the 2.0.32 behaviour may
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have been added late in the 2.1 series, however I have no
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idea at which patch level. Leave it like this until
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someone supplies some info. */
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freq_scale = (hz==100) ? (128.0 / 125.0) : basic_freq_scale;
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have_readonly_adjtime = 0; /* For safety ! */
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break;
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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if (minor < 6 || patch < 27) {
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/* These seem to be like 2.0.32 */
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freq_scale = (hz==100) ? (128.0 / 128.125) : basic_freq_scale;
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have_readonly_adjtime = 0;
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break;
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}
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if (patch < 33) {
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/* Tickless kernels before 2.6.33 accumulated ticks only in
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half-second intervals. */
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tick_update_hz = 2;
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}
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/* fall through */
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default:
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/* These don't seem to need scaling */
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freq_scale = 1.0;
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have_readonly_adjtime = 2;
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have_nanopll = 1;
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break;
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}
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break;
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default:
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/* Let's be optimistic that these will be the same until proven
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otherwise :-) */
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freq_scale = 1.0;
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have_readonly_adjtime = 2;
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have_nanopll = 1;
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break;
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if (kernelvercmp(major, minor, patch, 2, 2, 0) < 0) {
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LOG_FATAL(LOGF_SysLinux, "Kernel version not supported, sorry.");
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}
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if (kernelvercmp(major, minor, patch, 2, 6, 27) < 0) {
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freq_scale = (hz == 100) ? (128.0 / 128.125) : basic_freq_scale;
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} else {
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/* These don't seem to need scaling */
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freq_scale = 1.0;
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if (kernelvercmp(major, minor, patch, 2, 6, 33) < 0) {
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/* Tickless kernels before 2.6.33 accumulated ticks only in
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half-second intervals */
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tick_update_hz = 2;
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}
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}
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/* ADJ_OFFSET_SS_READ support */
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if (kernelvercmp(major, minor, patch, 2, 6, 27) < 0) {
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have_readonly_adjtime = 0;
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} else {
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have_readonly_adjtime = 2;
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}
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/* ADJ_NANO support */
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if (kernelvercmp(major, minor, patch, 2, 6, 27) < 0) {
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have_nanopll = 0;
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} else {
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have_nanopll = 1;
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}
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/* Override freq_scale if it appears in conf file */
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@ -1067,7 +1024,6 @@ get_version_specific_details(void)
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LOG(LOGS_INFO, LOGF_SysLinux, "calculated_freq_scale=%.8f freq_scale=%.8f",
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calculated_freq_scale, freq_scale);
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}
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}
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/* ================================================== */
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