linux-kernel - [RESEND PATCH 1/2] ARC: fix incorrect THREAD

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 26 May 2023 00:08:11 +0800
From:   Min-Hua Chen <minhuadotchen@...il.com>
To:     Vineet Gupta <vgupta@...nel.org>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Min-Hua Chen <minhuadotchen@...il.com>
Subject: [RESEND PATCH 1/2] ARC: fix incorrect THREAD_SHIFT definition

Current definition of THREAD_SHIFT is (PAGE_SHIFT << THREAD_SIZE_ORDER)
It should be (PAGE_SHIFT + THREAD_SIZE_ORDER) because the following
equation should hold:

Say PAGE_SHIFT == 13 (as the default value in ARC)
THREAD_SIZE_ORDER == 1 (as CONFIG_16KSTACKS=y)

THREAD_SIZE == (1 << THREAD_SHIFT)
            == (1 << (PAGE_SHIFT + THREAD_SIZE_ORDER))
	    == (1 << 14)
	    == 16KB

Signed-off-by: Min-Hua Chen <minhuadotchen@...il.com>
---
 arch/arc/include/asm/thread_info.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h
index 6ba7fe417095..9f9dd021501c 100644
--- a/arch/arc/include/asm/thread_info.h
+++ b/arch/arc/include/asm/thread_info.h
@@ -22,7 +22,7 @@
 #endif
 
 #define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)
-#define THREAD_SHIFT	(PAGE_SHIFT << THREAD_SIZE_ORDER)
+#define THREAD_SHIFT	(PAGE_SHIFT + THREAD_SIZE_ORDER)
 
 #ifndef __ASSEMBLY__
 
-- 
2.34.1