linux-kernel - [PATCH v3 05/10] powerpc/fsl_booke: Take exec flag into account when setting TLBCAMs

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Message-Id: <6c25f98b9122a6f5fc73c40648583902c2f468c2.1635198209.git.christophe.leroy@csgroup.eu>
Date:   Mon, 25 Oct 2021 23:44:17 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3 05/10] powerpc/fsl_booke: Take exec flag into account when setting TLBCAMs

Don't force MAS3_SX and MAS3_UX at all time. Take into account the
exec flag.

While at it, fix a couple of closeby style problems (indent with space
and unnecessary parenthesis), it keeps more readability.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v3: No change
v2: Use the new _PAGE_EXEC to check executability of flags instead of _PAGE_BAP_SX (Error reported by robot with tqm8541_defconfig)
---
 arch/powerpc/mm/nohash/fsl_book3e.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/mm/nohash/fsl_book3e.c b/arch/powerpc/mm/nohash/fsl_book3e.c
index 03dacbe940e5..2668bb06e4fa 100644
--- a/arch/powerpc/mm/nohash/fsl_book3e.c
+++ b/arch/powerpc/mm/nohash/fsl_book3e.c
@@ -122,15 +122,18 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 	TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
 	TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
 
-	TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SX | MAS3_SR;
-	TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
+	TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SR;
+	TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_SW : 0;
 	if (mmu_has_feature(MMU_FTR_BIG_PHYS))
 		TLBCAM[index].MAS7 = (u64)phys >> 32;
 
 	/* Below is unlikely -- only for large user pages or similar */
 	if (pte_user(__pte(flags))) {
-	   TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
-	   TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
+		TLBCAM[index].MAS3 |= MAS3_UR;
+		TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_UX : 0;
+		TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_UW : 0;
+	} else {
+		TLBCAM[index].MAS3 |= (flags & _PAGE_EXEC) ? MAS3_SX : 0;
 	}
 
 	tlbcam_addrs[index].start = virt;
-- 
2.31.1