This is a note to let you know that I've just added the patch titled
x86: Introduce ia32_enabled()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-introduce-ia32_enabled.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f8505ab86dd9e2836efc48442babe8afcb341cb6 Mon Sep 17 00:00:00 2001
From: Nikolay Borisov <nik.borisov@xxxxxxxx>
Date: Fri, 23 Jun 2023 14:14:04 +0300
Subject: x86: Introduce ia32_enabled()
From: Nikolay Borisov <nik.borisov@xxxxxxxx>
[ upstream commit 1da5c9bc119d3a749b519596b93f9b2667e93c4a ]
IA32 support on 64bit kernels depends on whether CONFIG_IA32_EMULATION
is selected or not. As it is a compile time option it doesn't
provide the flexibility to have distributions set their own policy for
IA32 support and give the user the flexibility to override it.
As a first step introduce ia32_enabled() which abstracts whether IA32
compat is turned on or off. Upcoming patches will implement
the ability to set IA32 compat state at boot time.
Signed-off-by: Nikolay Borisov <nik.borisov@xxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230623111409.3047467-2-nik.borisov@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/entry/common.c | 4 ++++
arch/x86/include/asm/ia32.h | 16 +++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -96,6 +96,10 @@ static __always_inline int syscall_32_en
return (int)regs->orig_ax;
}
+#ifdef CONFIG_IA32_EMULATION
+bool __ia32_enabled __ro_after_init = true;
+#endif
+
/*
* Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL.
*/
--- a/arch/x86/include/asm/ia32.h
+++ b/arch/x86/include/asm/ia32.h
@@ -68,6 +68,20 @@ extern void ia32_pick_mmap_layout(struct
#endif
-#endif /* CONFIG_IA32_EMULATION */
+extern bool __ia32_enabled;
+
+static inline bool ia32_enabled(void)
+{
+ return __ia32_enabled;
+}
+
+#else /* !CONFIG_IA32_EMULATION */
+
+static inline bool ia32_enabled(void)
+{
+ return IS_ENABLED(CONFIG_X86_32);
+}
+
+#endif
#endif /* _ASM_X86_IA32_H */
Patches currently in stable-queue which might be from nik.borisov@xxxxxxxx are
queue-6.6/x86-introduce-ia32_enabled.patch
