linux-kernel - [PATCH] scs: Report SCS usage in bytes rather than number of entries

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Message-Id: <20200603151218.11659-1-will@kernel.org>
Date:   Wed,  3 Jun 2020 16:12:17 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH] scs: Report SCS usage in bytes rather than number of entries

Fix the SCS debug usage check so that we report the number of bytes
usedm, rather than the number of entries.

Fixes: 5bbaf9d1fcb9 ("scs: Add support for stack usage debugging")
Reported-by: Sami Tolvanen <samitolvanen@...gle.com>
Signed-off-by: Will Deacon <will@...nel.org>
---
 kernel/scs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/scs.c b/kernel/scs.c
index 222a7a9ad543..5d4d9bbdec36 100644
--- a/kernel/scs.c
+++ b/kernel/scs.c
@@ -74,7 +74,7 @@ static void scs_check_usage(struct task_struct *tsk)
 	for (p = task_scs(tsk); p < __scs_magic(tsk); ++p) {
 		if (!READ_ONCE_NOCHECK(*p))
 			break;
-		used++;
+		used += sizeof(*p);
 	}
 
 	while (used > curr) {
-- 
2.27.0.rc2.251.g90737beb825-goog