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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2019-07-15 19:51:39 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-17 16:37:14 +0300 |
| commit | 64dbc122b20f75183d8822618c24f85144a5a94d (patch) | |
| tree | 49399e44a25bed365000cf7ae9af240db1065350 /Documentation/admin-guide | |
| parent | a2059825986a1c8143fd6698774fa9d83733bb11 (diff) | |
| download | linux-64dbc122b20f75183d8822618c24f85144a5a94d.tar.xz | |
x86/entry/64: Use JMP instead of JMPQ
Somehow the swapgs mitigation entry code patch ended up with a JMPQ
instruction instead of JMP, where only the short jump is needed. Some
assembler versions apparently fail to optimize JMPQ into a two-byte JMP
when possible, instead always using a 7-byte JMP with relocation. For
some reason that makes the entry code explode with a #GP during boot.
Change it back to "JMP" as originally intended.
Fixes: 18ec54fdd6d1 ("x86/speculation: Prepare entry code for Spectre v1 swapgs mitigations")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/admin-guide')
0 files changed, 0 insertions, 0 deletions