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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-08 12:50:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-12 16:57:57 -0700 |
| commit | ea6f043fc9847e670b91dfbf1ef1cdff3451c152 (patch) | |
| tree | b91a008b262a787388e8bd72a511a9602ff060f8 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | Merge tag 'locks-v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux (diff) | |
| download | wireguard-linux-ea6f043fc9847e670b91dfbf1ef1cdff3451c152.tar.xz wireguard-linux-ea6f043fc9847e670b91dfbf1ef1cdff3451c152.zip | |
x86: Make __get_user() generate an out-of-line call
Instead of inlining the whole stac/lfence/mov/clac sequence (which also
requires individual exception table entries and several asm instruction
alternatives entries), just generate "call __get_user_nocheck_X" for the
__get_user() cases.
We can use all the same infrastructure that we already do for the
regular "get_user()", and the end result is simpler source code, and
much simpler code generation.
It also means that when I introduce asm goto with input for
"unsafe_get_user()", there are no nasty interactions with the
__get_user() code.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions