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| author |  Peter Zijlstra <peterz@infradead.org>
| 2023-08-02 12:55:46 +0200 |
|---|---|---|
| committer |  Ingo Molnar <mingo@kernel.org>
| 2023-09-12 17:50:53 +0200 |
| commit | 25e73b7e3f72a25aa30cbb2eecb49036e0acf066 (patch) | |
| tree | ec51d86d83644e810a6ea761725bd6c344654dca /arch/x86/lib/putuser.S | |
| parent | x86/platform/uv: Use alternate source for socket to node data (diff) | |
| download | linux-25e73b7e3f72a25aa30cbb2eecb49036e0acf066.tar.gz linux-25e73b7e3f72a25aa30cbb2eecb49036e0acf066.tar.bz2 linux-25e73b7e3f72a25aa30cbb2eecb49036e0acf066.zip | |
x86/ibt: Suppress spurious ENDBR
It was reported that under certain circumstances GCC emits ENDBR
instructions for _THIS_IP_ usage. Specifically, when it appears at the
start of a basic block -- but not elsewhere.
Since _THIS_IP_ is never used for control flow, these ENDBR
instructions are completely superfluous. Override the _THIS_IP_
definition for x86_64 to avoid this.
Less ENDBR instructions is better.
Fixes: 156ff4a544ae ("x86/ibt: Base IBT bits")
Reported-by: David Kaplan <David.Kaplan@amd.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230802110323.016197440@infradead.org
Diffstat (limited to 'arch/x86/lib/putuser.S')
0 files changed, 0 insertions, 0 deletions