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Steven Price
e47690d756
struct mm_struct is quite large (~1664 bytes) and so allocating on the stack may cause problems as the kernel stack size is small. Since ptdump_walk_pgd_level_core() was only allocating the structure so that it could modify the pgd argument we can instead introduce a pgd override in struct mm_walk and pass this down the call stack to where it is needed. Since the correct mm_struct is now being passed down, it is now also unnecessary to take the mmap_sem semaphore because ptdump_walk_pgd() will now take the semaphore on the real mm. [[email protected]: restore missed arm64 changes] Link: http://lkml.kernel.org/r/[email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Steven Price <[email protected]> Reported-by: Stephen Rothwell <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Albert Ou <[email protected]> Cc: Alexandre Ghiti <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Dave Hansen <[email protected]> Cc: David S. Miller <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: James Hogan <[email protected]> Cc: James Morse <[email protected]> Cc: Jerome Glisse <[email protected]> Cc: "Liang, Kan" <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Paul Burton <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Paul Walmsley <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Russell King <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Will Deacon <[email protected]> Cc: Zong Li <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
23 lines
507 B
C
23 lines
507 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PTDUMP_H
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#define _LINUX_PTDUMP_H
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#include <linux/mm_types.h>
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struct ptdump_range {
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unsigned long start;
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unsigned long end;
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};
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struct ptdump_state {
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/* level is 0:PGD to 4:PTE, or -1 if unknown */
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void (*note_page)(struct ptdump_state *st, unsigned long addr,
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int level, unsigned long val);
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const struct ptdump_range *range;
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};
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void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd);
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#endif /* _LINUX_PTDUMP_H */
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