linux-kernel - [PATCH 21/24] swap: make swapin_readahead result checking argument mandatory

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Message-ID: <20231119194740.94101-22-ryncsn@gmail.com>
Date:   Mon, 20 Nov 2023 03:47:37 +0800
From:   Kairui Song <ryncsn@...il.com>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Huang, Ying" <ying.huang@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org,
        Kairui Song <kasong@...cent.com>
Subject: [PATCH 21/24] swap: make swapin_readahead result checking argument mandatory

From: Kairui Song <kasong@...cent.com>

This is only one caller now in page fault path, make the result return
argument mandatory.

Signed-off-by: Kairui Song <kasong@...cent.com>
---
 mm/swap_state.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 6f39aa8394f1..0433a2586c6d 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -913,7 +913,6 @@ static struct page *swapin_no_readahead(swp_entry_t entry, gfp_t gfp_mask,
 struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask,
 			      struct vm_fault *vmf, enum swap_cache_result *result)
 {
-	enum swap_cache_result cache_result;
 	struct swap_info_struct *si;
 	struct mempolicy *mpol;
 	void *shadow = NULL;
@@ -928,29 +927,27 @@ struct page *swapin_readahead(swp_entry_t entry, gfp_t gfp_mask,
 
 	folio = swap_cache_get_folio(entry, vmf, &shadow);
 	if (folio) {
+		*result = SWAP_CACHE_HIT;
 		page = folio_file_page(folio, swp_offset(entry));
-		cache_result = SWAP_CACHE_HIT;
 		goto done;
 	}
 
 	mpol = get_vma_policy(vmf->vma, vmf->address, 0, &ilx);
 	if (swap_use_no_readahead(si, swp_offset(entry))) {
+		*result = SWAP_CACHE_BYPASS;
 		page = swapin_no_readahead(entry, gfp_mask, mpol, ilx, vmf->vma->vm_mm);
-		cache_result = SWAP_CACHE_BYPASS;
 		if (shadow)
 			workingset_refault(page_folio(page), shadow);
-	} else if (swap_use_vma_readahead(si)) {
-		page = swap_vma_readahead(entry, gfp_mask, mpol, ilx, vmf);
-		cache_result = SWAP_CACHE_MISS;
 	} else {
-		page = swap_cluster_readahead(entry, gfp_mask, mpol, ilx);
-		cache_result = SWAP_CACHE_MISS;
+		*result = SWAP_CACHE_MISS;
+		if (swap_use_vma_readahead(si))
+			page = swap_vma_readahead(entry, gfp_mask, mpol, ilx, vmf);
+		else
+			page = swap_cluster_readahead(entry, gfp_mask, mpol, ilx);
 	}
 	mpol_cond_put(mpol);
 done:
 	put_swap_device(si);
-	if (result)
-		*result = cache_result;
 
 	return page;
 }
-- 
2.42.0