linux-kernel - [PATCH 2/4] s390: make STACK_FRAME_OVERHEAD available via asm-offsets.h

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Message-Id: <20211012133802.2460757-3-hca@linux.ibm.com>
Date:   Tue, 12 Oct 2021 15:38:00 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH 2/4] s390: make STACK_FRAME_OVERHEAD available via asm-offsets.h

Make STACK_FRAME_OVERHEAD available via asm-offsets.h. This allows to
add s390 specific asm code to e.g. ftrace samples, without requiring
to add random header files, which might cause all sort of problems on
other architectures. asm-offsets.h can be assumed to be non-problematic.

Acked-by: Ilya Leoshkevich <iii@...ux.ibm.com>
Reviewed-by: Sven Schnelle <svens@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/kernel/asm-offsets.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index b57da9338588..b6ee3fd7fe0c 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -45,6 +45,7 @@ int main(void)
 	OFFSET(__SF_SIE_SAVEAREA, stack_frame, empty1[2]);
 	OFFSET(__SF_SIE_REASON, stack_frame, empty1[3]);
 	OFFSET(__SF_SIE_FLAGS, stack_frame, empty1[4]);
+	DEFINE(STACK_FRAME_OVERHEAD, sizeof(struct stack_frame));
 	BLANK();
 	/* idle data offsets */
 	OFFSET(__CLOCK_IDLE_ENTER, s390_idle_data, clock_idle_enter);
-- 
2.25.1