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Subject[PATCH v1 25/27] powerpc/mm: flatten function __find_linux_pte()
Date
__find_linux_pte() is full of if/else which is hard to
follow allthough the handling is pretty simple.

This patch flattens the function by getting rid of as much if/else
as possible. In order to ease the review, this is done in two steps.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/mm/pgtable.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 9f4ccd15849f..d332abeedf0a 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -339,12 +339,16 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
*/
if (pgd_none(pgd))
return NULL;
- else if (pgd_huge(pgd)) {
- ret_pte = (pte_t *) pgdp;
+
+ if (pgd_huge(pgd)) {
+ ret_pte = (pte_t *)pgdp;
goto out;
- } else if (is_hugepd(__hugepd(pgd_val(pgd))))
+ }
+ if (is_hugepd(__hugepd(pgd_val(pgd)))) {
hpdp = (hugepd_t *)&pgd;
- else {
+ goto out_huge;
+ }
+ {
/*
* Even if we end up with an unmap, the pgtable will not
* be freed, because we do an rcu free and here we are
@@ -356,12 +360,16 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,

if (pud_none(pud))
return NULL;
- else if (pud_huge(pud)) {
+
+ if (pud_huge(pud)) {
ret_pte = (pte_t *) pudp;
goto out;
- } else if (is_hugepd(__hugepd(pud_val(pud))))
+ }
+ if (is_hugepd(__hugepd(pud_val(pud)))) {
hpdp = (hugepd_t *)&pud;
- else {
+ goto out_huge;
+ }
+ {
pdshift = PMD_SHIFT;
pmdp = pmd_offset(&pud, ea);
pmd = READ_ONCE(*pmdp);
@@ -386,12 +394,16 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
if (pmd_huge(pmd) || pmd_large(pmd)) {
ret_pte = (pte_t *) pmdp;
goto out;
- } else if (is_hugepd(__hugepd(pmd_val(pmd))))
+ }
+ if (is_hugepd(__hugepd(pmd_val(pmd)))) {
hpdp = (hugepd_t *)&pmd;
- else
- return pte_offset_kernel(&pmd, ea);
+ goto out_huge;
+ }
+
+ return pte_offset_kernel(&pmd, ea);
}
}
+out_huge:
if (!hpdp)
return NULL;

--
2.13.3
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