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author | Uros Bizjak <ubizjak@gmail.com> | 2023-02-27 19:09:17 +0300 |
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committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-04-07 15:34:24 +0300 |
commit | f96fb2df3eb31ede1b34b0521560967310267750 (patch) | |
tree | 95db336bc06881513bf8c02e9ad50530c5d77c10 /arch/arm/mach-oxnas/headsmp.S | |
parent | 5b422b9bb7318b5ab8d0c124d623db4d3f6b2771 (diff) | |
download | linux-f96fb2df3eb31ede1b34b0521560967310267750.tar.xz |
x86/apic: Fix atomic update of offset in reserve_eilvt_offset()
The detection of atomic update failure in reserve_eilvt_offset() is
not correct. The value returned by atomic_cmpxchg() should be compared
to the old value from the location to be updated.
If these two are the same, then atomic update succeeded and
"eilvt_offsets[offset]" location is updated to "new" in an atomic way.
Otherwise, the atomic update failed and it should be retried with the
value from "eilvt_offsets[offset]" - exactly what atomic_try_cmpxchg()
does in a correct and more optimal way.
Fixes: a68c439b1966c ("apic, x86: Check if EILVT APIC registers are available (AMD only)")
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230227160917.107820-1-ubizjak@gmail.com
Diffstat (limited to 'arch/arm/mach-oxnas/headsmp.S')
0 files changed, 0 insertions, 0 deletions