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If a page is marked read only we should print out that fact, instead of printing out that there was a page fault. Right now we get a cryptic error message that something went wrong with an unhandled fault, but we don't evaluate the esr to figure out that it was a read/write permission fault. Instead of seeing: Unable to handle kernel paging request at virtual address ffff000008e460d8 pgd = ffff800003504000 [ffff000008e460d8] *pgd=0000000083473003, *pud=0000000083503003, *pmd=0000000000000000 Internal error: Oops: 9600004f [#1] PREEMPT SMP we'll see: Unable to handle kernel write to read-only memory at virtual address ffff000008e760d8 pgd = ffff80003d3de000 [ffff000008e760d8] *pgd=0000000083472003, *pud=0000000083435003, *pmd=0000000000000000 Internal error: Oops: 9600004f [#1] PREEMPT SMP We also add a userspace address check into is_permission_fault() so that the function doesn't return true for ttbr0 PAN faults when it shouldn't. Reviewed-by: James Morse <james.morse@arm.com> Tested-by: James Morse <james.morse@arm.com> Acked-by: Laura Abbott <labbott@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.