[PATCH 4.9 11/62] mm/kasan: Switch to using __pa_symbol and lm_alias

[Greg Kroah-Hartman]

From: Laura Abbott <labb...@redhat.com>

commit 5c6a84a3f4558a6115fef1b59343c7ae56b3abc3 upstream.

__pa_symbol is the correct API to find the physical address of symbols.
Switch to it to allow for debugging APIs to work correctly. Other
functions such as p*d_populate may call __pa internally. Ensure that the
address passed is in the linear region by calling lm_alias.

Reviewed-by: Mark Rutland <mark.rutl...@arm.com>
Tested-by: Mark Rutland <mark.rutl...@arm.com>
Signed-off-by: Laura Abbott <labb...@redhat.com>
Signed-off-by: Will Deacon <will.dea...@arm.com>
Signed-off-by: Andrey Konovalov <andreyk...@google.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 mm/kasan/kasan_init.c |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

--- a/mm/kasan/kasan_init.c
+++ b/mm/kasan/kasan_init.c
@@ -15,6 +15,7 @@
 #include <linux/kasan.h>
 #include <linux/kernel.h>
 #include <linux/memblock.h>
+#include <linux/mm.h>
 #include <linux/pfn.h>
 
 #include <asm/page.h>
@@ -49,7 +50,7 @@ static void __init zero_pte_populate(pmd
        pte_t *pte = pte_offset_kernel(pmd, addr);
        pte_t zero_pte;
 
-       zero_pte = pfn_pte(PFN_DOWN(__pa(kasan_zero_page)), PAGE_KERNEL);
+       zero_pte = pfn_pte(PFN_DOWN(__pa_symbol(kasan_zero_page)), PAGE_KERNEL);
        zero_pte = pte_wrprotect(zero_pte);
 
        while (addr + PAGE_SIZE <= end) {
@@ -69,7 +70,7 @@ static void __init zero_pmd_populate(pud
                next = pmd_addr_end(addr, end);
 
                if (IS_ALIGNED(addr, PMD_SIZE) && end - addr >= PMD_SIZE) {
-                       pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                       pmd_populate_kernel(&init_mm, pmd, 
lm_alias(kasan_zero_pte));
                        continue;
                }
 
@@ -92,9 +93,9 @@ static void __init zero_pud_populate(pgd
                if (IS_ALIGNED(addr, PUD_SIZE) && end - addr >= PUD_SIZE) {
                        pmd_t *pmd;
 
-                       pud_populate(&init_mm, pud, kasan_zero_pmd);
+                       pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
                        pmd = pmd_offset(pud, addr);
-                       pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                       pmd_populate_kernel(&init_mm, pmd, 
lm_alias(kasan_zero_pte));
                        continue;
                }
 
@@ -135,11 +136,11 @@ void __init kasan_populate_zero_shadow(c
                         * puds,pmds, so pgd_populate(), pud_populate()
                         * is noops.
                         */
-                       pgd_populate(&init_mm, pgd, kasan_zero_pud);
+                       pgd_populate(&init_mm, pgd, lm_alias(kasan_zero_pud));
                        pud = pud_offset(pgd, addr);
-                       pud_populate(&init_mm, pud, kasan_zero_pmd);
+                       pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
                        pmd = pmd_offset(pud, addr);
-                       pmd_populate_kernel(&init_mm, pmd, kasan_zero_pte);
+                       pmd_populate_kernel(&init_mm, pmd, 
lm_alias(kasan_zero_pte));
                        continue;
                }