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authorLinus Torvalds <torvalds@linux-foundation.org>2015-03-28 10:58:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-03-28 10:58:53 -0700
commit713d25dba93ec3e739e209cd13bf7e1e9b00171a (patch)
treec9bb10963ea7146b40720f76d348d36847e7a4b0
parent22824c536947d2a8c1130dd75e1e278288fbf899 (diff)
parent2e3f0ab2bb4853694570b9610b1fcfbfa8fd295b (diff)
downloadlinux-713d25dba93ec3e739e209cd13bf7e1e9b00171a.tar.gz
Merge branch 'parisc-4.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
Pull parsic fixes from Helge Deller: "One patch from Mikulas fixes a bug on parisc by artifically incrementing the counter in pmd_free when the kernel tries to free the preallocated pmd. Other than that we now prevent that syscalls gets added without incrementing __NR_Linux_syscalls and fix the initial pmd setup code if a default page size greater than 4k has been selected" * 'parisc-4.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix pmd code to depend on PT_NLEVELS value, not on CONFIG_64BIT parisc: mm: don't count preallocated pmds parisc: Add compile-time check when adding new syscalls
-rw-r--r--arch/parisc/include/asm/pgalloc.h17
-rw-r--r--arch/parisc/kernel/syscall_table.S9
2 files changed, 16 insertions, 10 deletions
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index f213f5b4c42..d17437238a2 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -26,7 +26,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
if (likely(pgd != NULL)) {
memset(pgd, 0, PAGE_SIZE<<PGD_ALLOC_ORDER);
-#ifdef CONFIG_64BIT
+#if PT_NLEVELS == 3
actual_pgd += PTRS_PER_PGD;
/* Populate first pmd with allocated memory. We mark it
* with PxD_FLAG_ATTACHED as a signal to the system that this
@@ -45,7 +45,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
-#ifdef CONFIG_64BIT
+#if PT_NLEVELS == 3
pgd -= PTRS_PER_PGD;
#endif
free_pages((unsigned long)pgd, PGD_ALLOC_ORDER);
@@ -72,12 +72,15 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
-#ifdef CONFIG_64BIT
if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
- /* This is the permanent pmd attached to the pgd;
- * cannot free it */
+ /*
+ * This is the permanent pmd attached to the pgd;
+ * cannot free it.
+ * Increment the counter to compensate for the decrement
+ * done by generic mm code.
+ */
+ mm_inc_nr_pmds(mm);
return;
-#endif
free_pages((unsigned long)pmd, PMD_ORDER);
}
@@ -99,7 +102,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
-#ifdef CONFIG_64BIT
+#if PT_NLEVELS == 3
/* preserve the gateway marker if this is the beginning of
* the permanent pmd */
if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index 5a8997d6389..8eefb12d1d3 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -55,8 +55,8 @@
#define ENTRY_COMP(_name_) .word sys_##_name_
#endif
- ENTRY_SAME(restart_syscall) /* 0 */
- ENTRY_SAME(exit)
+90: ENTRY_SAME(restart_syscall) /* 0 */
+91: ENTRY_SAME(exit)
ENTRY_SAME(fork_wrapper)
ENTRY_SAME(read)
ENTRY_SAME(write)
@@ -439,7 +439,10 @@
ENTRY_SAME(bpf)
ENTRY_COMP(execveat)
- /* Nothing yet */
+
+.ifne (. - 90b) - (__NR_Linux_syscalls * (91b - 90b))
+.error "size of syscall table does not fit value of __NR_Linux_syscalls"
+.endif
#undef ENTRY_SAME
#undef ENTRY_DIFF