linux-kernel - [PATCH 3/3] powerpc/fsl_booke: Fix setting of exec flag when setting TLBCAMs

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Message-Id: <91a0235e7f2a85308b84aa5b9efd8d022e2b899a.1635226743.git.christophe.leroy@csgroup.eu>
Date:   Tue, 26 Oct 2021 07:39:26 +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,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 3/3] powerpc/fsl_booke: Fix setting of exec flag when setting TLBCAMs

Building tqm8541_defconfig results in:

	arch/powerpc/mm/nohash/fsl_book3e.c: In function 'settlbcam':
	arch/powerpc/mm/nohash/fsl_book3e.c:126:40: error: '_PAGE_BAP_SX' undeclared (first use in this function)
	  126 |         TLBCAM[index].MAS3 |= (flags & _PAGE_BAP_SX) ? MAS3_SX : 0;
	      |                                        ^~~~~~~~~~~~
	arch/powerpc/mm/nohash/fsl_book3e.c:126:40: note: each undeclared identifier is reported only once for each function it appears in
	make[3]: *** [scripts/Makefile.build:277: arch/powerpc/mm/nohash/fsl_book3e.o] Error 1
	make[2]: *** [scripts/Makefile.build:540: arch/powerpc/mm/nohash] Error 2
	make[1]: *** [scripts/Makefile.build:540: arch/powerpc/mm] Error 2
	make: *** [Makefile:1868: arch/powerpc] Error 2

This is because _PAGE_BAP_SX is not defined when using 32 bits PTE.

Now that _PAGE_EXEC contains both _PAGE_BAP_SX and _PAGE_BAP_UX, it can be used instead.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: 01116e6e98b0 ("powerpc/fsl_booke: Take exec flag into account when setting TLBCAMs")
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/mm/nohash/fsl_book3e.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/nohash/fsl_book3e.c b/arch/powerpc/mm/nohash/fsl_book3e.c
index 978e0bcdfa2c..b231a54f540c 100644
--- a/arch/powerpc/mm/nohash/fsl_book3e.c
+++ b/arch/powerpc/mm/nohash/fsl_book3e.c
@@ -123,7 +123,6 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 	TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
 
 	TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SR;
-	TLBCAM[index].MAS3 |= (flags & _PAGE_BAP_SX) ? MAS3_SX : 0;
 	TLBCAM[index].MAS3 |= (flags & _PAGE_RW) ? MAS3_SW : 0;
 	if (mmu_has_feature(MMU_FTR_BIG_PHYS))
 		TLBCAM[index].MAS7 = (u64)phys >> 32;
@@ -133,6 +132,8 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 		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