[PATCH v8 16/20] x86: mm: Point to struct seq_file from struct pg_state

Steven Price
2019-04-03T14:18:17Z

mm/dump_pagetables.c passes both struct seq_file and struct pg_state
down the chain of walk_*_level() functions to be passed to note_page().
Instead place the struct seq_file in struct pg_state and access it from
struct pg_state (which is private to this file) in note_page().

Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/x86/mm/dump_pagetables.c | 69 ++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 34 deletions(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index e2b53db92c34..3d12ac031144 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -40,6 +40,7 @@ struct pg_state {
bool to_dmesg;
bool check_wx;
unsigned long wx_pages;
+ struct seq_file *seq;
};

struct addr_marker {
@@ -268,11 +269,12 @@ static void note_wx(struct pg_state *st)
* of PTE entries; the next one is different so we need to
* print what we collected so far.
*/
-static void note_page(struct seq_file *m, struct pg_state *st,
- pgprot_t new_prot, pgprotval_t new_eff, int level)
+static void note_page(struct pg_state *st, pgprot_t new_prot,
+ pgprotval_t new_eff, int level)
{
pgprotval_t prot, cur, eff;
static const char units[] = "BKMGTPE";
+ struct seq_file *m = st->seq;

/*
* If we have a "break" in the series, we need to flush the state that
@@ -358,8 +360,8 @@ static inline pgprotval_t effective_prot(pgprotval_t prot1, pgprotval_t prot2)
((prot1 | prot2) & _PAGE_NX);
}

-static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
- pgprotval_t eff_in, unsigned long P)
+static void walk_pte_level(struct pg_state *st, pmd_t addr, pgprotval_t eff_in,
+ unsigned long P)
{
int i;
pte_t *pte;
@@ -370,7 +372,7 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
pte = pte_offset_map(&addr, st->current_address);
prot = pte_flags(*pte);
eff = effective_prot(eff_in, prot);
- note_page(m, st, __pgprot(prot), eff, 5);
+ note_page(st, __pgprot(prot), eff, 5);
pte_unmap(pte);
}
}
@@ -383,22 +385,20 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
* us dozens of seconds (minutes for 5-level config) while checking for
* W+X mapping or reading kernel_page_tables debugfs file.
*/
-static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
- void *pt)
+static inline bool kasan_page_table(struct pg_state *st, void *pt)
{
if (__pa(pt) == __pa(kasan_early_shadow_pmd) ||
(pgtable_l5_enabled() &&
__pa(pt) == __pa(kasan_early_shadow_p4d)) ||
__pa(pt) == __pa(kasan_early_shadow_pud)) {
pgprotval_t prot = pte_flags(kasan_early_shadow_pte[0]);
- note_page(m, st, __pgprot(prot), 0, 5);
+ note_page(st, __pgprot(prot), 0, 5);
return true;
}
return false;
}
#else
-static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,
- void *pt)
+static inline bool kasan_page_table(struct pg_state *st, void *pt)
{
return false;
}
@@ -406,7 +406,7 @@ static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st,

#if PTRS_PER_PMD > 1

-static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
+static void walk_pmd_level(struct pg_state *st, pud_t addr,
pgprotval_t eff_in, unsigned long P)
{
int i;
@@ -420,19 +420,19 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
prot = pmd_flags(*start);
eff = effective_prot(eff_in, prot);
if (pmd_large(*start) || !pmd_present(*start)) {
- note_page(m, st, __pgprot(prot), eff, 4);
- } else if (!kasan_page_table(m, st, pmd_start)) {
- walk_pte_level(m, st, *start, eff,
+ note_page(st, __pgprot(prot), eff, 4);
+ } else if (!kasan_page_table(st, pmd_start)) {
+ walk_pte_level(st, *start, eff,
P + i * PMD_LEVEL_MULT);
}
} else
- note_page(m, st, __pgprot(0), 0, 4);
+ note_page(st, __pgprot(0), 0, 4);
start++;
}
}

#else
-#define walk_pmd_level(m,s,a,e,p) walk_pte_level(m,s,__pmd(pud_val(a)),e,p)
+#define walk_pmd_level(s,a,e,p) walk_pte_level(s,__pmd(pud_val(a)),e,p)
#undef pud_large
#define pud_large(a) pmd_large(__pmd(pud_val(a)))
#define pud_none(a) pmd_none(__pmd(pud_val(a)))
@@ -440,8 +440,8 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,

#if PTRS_PER_PUD > 1

-static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
- pgprotval_t eff_in, unsigned long P)
+static void walk_pud_level(struct pg_state *st, p4d_t addr, pgprotval_t eff_in,
+ unsigned long P)
{
int i;
pud_t *start, *pud_start;
@@ -455,34 +455,34 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
prot = pud_flags(*start);
eff = effective_prot(eff_in, prot);
if (pud_large(*start) || !pud_present(*start)) {
- note_page(m, st, __pgprot(prot), eff, 3);
- } else if (!kasan_page_table(m, st, pud_start)) {
- walk_pmd_level(m, st, *start, eff,
+ note_page(st, __pgprot(prot), eff, 3);
+ } else if (!kasan_page_table(st, pud_start)) {
+ walk_pmd_level(st, *start, eff,
P + i * PUD_LEVEL_MULT);
}
} else
- note_page(m, st, __pgprot(0), 0, 3);
+ note_page(st, __pgprot(0), 0, 3);

start++;
}
}

#else
-#define walk_pud_level(m,s,a,e,p) walk_pmd_level(m,s,__pud(p4d_val(a)),e,p)
+#define walk_pud_level(s,a,e,p) walk_pmd_level(s,__pud(p4d_val(a)),e,p)
#undef p4d_large
#define p4d_large(a) pud_large(__pud(p4d_val(a)))
#define p4d_none(a) pud_none(__pud(p4d_val(a)))
#endif

-static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
- pgprotval_t eff_in, unsigned long P)
+static void walk_p4d_level(struct pg_state *st, pgd_t addr, pgprotval_t eff_in,
+ unsigned long P)
{
int i;
p4d_t *start, *p4d_start;
pgprotval_t prot, eff;

if (PTRS_PER_P4D == 1)
- return walk_pud_level(m, st, __p4d(pgd_val(addr)), eff_in, P);
+ return walk_pud_level(st, __p4d(pgd_val(addr)), eff_in, P);

p4d_start = start = (p4d_t *)pgd_page_vaddr(addr);

@@ -492,13 +492,13 @@ static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
prot = p4d_flags(*start);
eff = effective_prot(eff_in, prot);
if (p4d_large(*start) || !p4d_present(*start)) {
- note_page(m, st, __pgprot(prot), eff, 2);
- } else if (!kasan_page_table(m, st, p4d_start)) {
- walk_pud_level(m, st, *start, eff,
+ note_page(st, __pgprot(prot), eff, 2);
+ } else if (!kasan_page_table(st, p4d_start)) {
+ walk_pud_level(st, *start, eff,
P + i * P4D_LEVEL_MULT);
}
} else
- note_page(m, st, __pgprot(0), 0, 2);
+ note_page(st, __pgprot(0), 0, 2);

start++;
}
@@ -536,6 +536,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
}

st.check_wx = checkwx;
+ st.seq = m;
if (checkwx)
st.wx_pages = 0;

@@ -549,13 +550,13 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
eff = prot;
#endif
if (pgd_large(*start) || !pgd_present(*start)) {
- note_page(m, &st, __pgprot(prot), eff, 1);
+ note_page(&st, __pgprot(prot), eff, 1);
} else {
- walk_p4d_level(m, &st, *start, eff,
+ walk_p4d_level(&st, *start, eff,
i * PGD_LEVEL_MULT);
}
} else
- note_page(m, &st, __pgprot(0), 0, 1);
+ note_page(&st, __pgprot(0), 0, 1);

cond_resched();
start++;
@@ -563,7 +564,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,

/* Flush out the last page */
st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
- note_page(m, &st, __pgprot(0), 0, 0);
+ note_page(&st, __pgprot(0), 0, 0);
if (!checkwx)
return;
if (st.wx_pages)
--
2.20.1