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resume: write offset in /sys/power/resume_offset

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Doing this the kernel will hibernate and resume successfully from a swap file.
Stop writing offset to /sys/power/resume, as this is not a parameter
the kernel takes from this input. (Change added by Sven Mueller)

function                                             old     new   delta
resume_main                                          522     561     +39
.rodata                                           103175  103182      +7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 46/0)               Total: 46 bytes

Signed-off-by: Jordi Pujol Palomer <jordipujolp@gmail.com>
Signed-off-by: Sven Mueller <sven.mueller72+busybox@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-03-20 14:01:04 +01:00
parent 2a2ca93530
commit 14ed4ec8a4
1 changed files with 8 additions and 1 deletions
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9
klibc-utils/resume.c
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@ -103,10 +103,17 @@ int resume_main(int argc UNUSED_PARAM, char **argv)
if (major(resume_device) == 0) { if (major(resume_device) == 0) {
bb_error_msg_and_die("invalid resume device: %s", argv[0]); bb_error_msg_and_die("invalid resume device: %s", argv[0]);
} }
ofs = (argv[1] ? xstrtoull(argv[1], 0) : 0); ofs = (argv[1] ? xstrtoull(argv[1], 0) : 0);
/* Old kernels have no /sys/power/resume_offset, set it only if necessary */
if (ofs != 0) {
fd = xopen("/sys/power/resume_offset", O_WRONLY);
s = xasprintf("%llu", ofs);
xwrite_str(fd, s);
}
fd = xopen("/sys/power/resume", O_WRONLY); fd = xopen("/sys/power/resume", O_WRONLY);
s = xasprintf("%u:%u:%llu", major(resume_device), minor(resume_device), ofs); s = xasprintf("%u:%u", major(resume_device), minor(resume_device));
xwrite_str(fd, s); xwrite_str(fd, s);
/* if write() returns, resume did not succeed */ /* if write() returns, resume did not succeed */