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Message-Id: <20181107194858.9380-2-bigeasy@linutronix.de>
Date: Wed, 7 Nov 2018 20:48:36 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, Andy Lutomirski <luto@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
kvm@...r.kernel.org, "Jason A. Donenfeld" <Jason@...c4.com>,
Rik van Riel <riel@...riel.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 01/23] x86/fpu: Use ULL for shift in xfeature_uncompacted_offset()
The xfeature mask is 64bit so a shift from a number to its mask should
have LL prefix or else nr > 31 will be lost. This is not a problem now
but should XFEATURE_MASK_SUPERVISOR gain a bit >31 then this check won't
catch it.
Add a ULL suffix so >31bit number will be properly shifted.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
arch/x86/kernel/fpu/xstate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 87a57b7642d36..9dc0a2c8c2755 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -444,7 +444,7 @@ static int xfeature_uncompacted_offset(int xfeature_nr)
* format. Checking a supervisor state's uncompacted offset is
* an error.
*/
- if (XFEATURE_MASK_SUPERVISOR & (1 << xfeature_nr)) {
+ if (XFEATURE_MASK_SUPERVISOR & (1ULL << xfeature_nr)) {
WARN_ONCE(1, "No fixed offset for xstate %d\n", xfeature_nr);
return -1;
}
--
2.19.1
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