[PATCH] ARM: 2698/1: Enable kernel r/w access to user pages on ARMv6
Patch from Catalin Marinas cpu_v6_set_pte() sets the kernel access rights to r/o for user pages (L_PTE_USER) when neither L_PTE_WRITE nor L_PTE_DIRTY are set. This causes a kernel data abort when writing the TLS value in the 0xffff0000 page. This patch enables the kernel r/w access. Signed-off-by: Catalin Marinas Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -132,8 +132,8 @@ ENTRY(cpu_v6_switch_mm)
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* 100x 1 0 1 r/o no acc
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* 10x0 1 0 1 r/o no acc
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* 1011 0 0 1 r/w no acc
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* 110x 1 1 0 r/o r/o
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* 11x0 1 1 0 r/o r/o
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* 110x 0 1 0 r/w r/o
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* 11x0 0 1 0 r/w r/o
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* 1111 0 1 1 r/w r/w
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*/
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ENTRY(cpu_v6_set_pte)
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@ -150,7 +150,7 @@ ENTRY(cpu_v6_set_pte)
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tst r1, #L_PTE_USER
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orrne r2, r2, #AP1 | nG
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tstne r2, #APX
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eorne r2, r2, #AP0
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bicne r2, r2, #APX | AP0
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tst r1, #L_PTE_YOUNG
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biceq r2, r2, #APX | AP1 | AP0
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