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| author | Kirill A. Shutemov <[email protected]> | 2018-05-16 11:01:28 +0300 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2018-05-16 12:15:13 +0200 |
| commit | 5c9b0b1c49881c680d4a56b9d9e03dfb3160fd4d (patch) | |
| tree | 42aa65ef4c13221b669153cd743c9346f9042b1a /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py | |
| parent | 2fa9d1cfaf0e02f8abef0757002bff12dfcfa4e6 (diff) | |
x86/boot/compressed/64: Set up GOT for paging_prepare() and cleanup_trampoline()
Eric and Hugh have reported instant reboot due to my recent changes in
decompression code.
The root cause is that I didn't realize that we need to adjust GOT to be
able to run C code that early.
The problem is only visible with an older toolchain. Binutils >= 2.24 is
able to eliminate GOT references by replacing them with RIP-relative
address loads:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=80d873266dec
We need to adjust GOT two times:
- before calling paging_prepare() using the initial load address
- before calling C code from the relocated kernel
Reported-by: Eric Dumazet <[email protected]>
Reported-by: Hugh Dickins <[email protected]>
Signed-off-by: Kirill A. Shutemov <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Fixes: 194a9749c73d ("x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py')
0 files changed, 0 insertions, 0 deletions