x86: Prepare inline-asm for straight-line-speculation
stable inclusion from stable-v5.10.133 commit 277f4ddc36c578691678b8ae59b60d76ad15fa1b category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=277f4ddc36c578691678b8ae59b60d76ad15fa1b -------------------------------- commit b17c2baa upstream. Replace all ret/retq instructions with ASM_RET in preparation of making it more than a single instruction. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NBorislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211204134907.964635458@infradead.orgSigned-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> [bwh: Backported to 5.10: adjust context] Signed-off-by: NBen Hutchings <ben@decadent.org.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NLin Yujun <linyujun809@huawei.com> Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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