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b=Bna+1el4eb1zN7Scsid60/Qy5eka2UlXtxe/Z/p6OQxqIOTtR4oywr/zwj7NGxOyX 1z1D5jpFc6vy69NQdMbOnSeWnHW6tYC3NKlkAzPVngHwCVR6+wrTYrfiYkdok92oMI NAAwVM/EGhZIy2ua7TD+RE4KiBDebnrCAUKGKqaPqWDjrMwXV6Uag1iJ92P+fozkyP abmAe2T3FTbDqZOIAHQufmgJsn3C4QQMz+8m8fJ0gKoIuQ0mlRphPluMOfpoe6f+eO Y8Kl2q+J8Y70xEg6kl/JPrCeTBUhMH1GIwBHsBVpgQC8vgzCNK7WFlVbzeXNG6z8Mn SwZTnOu3MG5dA== Message-ID: <1b81b2d8-d9e2-4c51-b475-785989aa81b1@kernel.org> Date: Wed, 13 May 2026 12:24:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] tools/mm/page-types: Fix ternary operator precedence in sigbus handler To: Ye Liu , Andrew Morton Cc: Ye Liu , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260513022120.58033-1-ye.liu@linux.dev> <20260513022120.58033-3-ye.liu@linux.dev> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260513022120.58033-3-ye.liu@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 59B55180002 X-Stat-Signature: xymb1n9nqjbtqzn5nanq3t5curbs7hdq X-Rspam-User: X-HE-Tag: 1778667882-110479 X-HE-Meta: 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 CYTagcZH BFlzWASjSowKlTZp6EICw/wG6e9vECr4MauM7HfFzI2VpMLst1moByV3c26B/24wmySPdn7k/m+M1l+J1OncQOIEMoemkWWq91OMqvDDDxxQdA+jtPUVQYrXD2ot0Mc9CRUxPnU1h2rg+Lj3RQ39WtMzzFA87SEXBtNG/Rltpl4XqzJyD4ma7G+znuuH50R2x6CcN2eAd0WzTpoQLL0LjiJnILmiJwud/wmaKtOYUlRKCVg4q4XdqRhdEQ9ey1Emggre1 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/13/26 04:21, Ye Liu wrote: > From: Ye Liu > > The ternary operator (?:) has lower precedence than addition (+), so > the expression `off + sigbus_addr ? sigbus_addr - ptr : 0` was parsed > as `(off + sigbus_addr) ? (sigbus_addr - ptr) : 0` rather than the > intended `off + (sigbus_addr ? sigbus_addr - ptr : 0)`. Add explicit > parentheses to ensure the correct evaluation order. > > Signed-off-by: Ye Liu > --- > tools/mm/page-types.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/mm/page-types.c b/tools/mm/page-types.c > index 6594245217a8..66f429f2b698 100644 > --- a/tools/mm/page-types.c > +++ b/tools/mm/page-types.c > @@ -1000,7 +1000,7 @@ static void walk_file_range(const char *name, int fd, > fatal("madvise failed: %s", name); > > if (sigsetjmp(sigbus_jmp, 1)) { > - end = off + sigbus_addr ? sigbus_addr - ptr : 0; > + end = off + (sigbus_addr ? sigbus_addr - ptr : 0); > fprintf(stderr, "got sigbus at offset %lld: %s\n", > (long long)end, name); > goto got_sigbus; "sigbus_addr - ptr" will give us the offset into the mmap(). Adding that to off will give us the offset into the file. No idea what happens if we don't have sigbus_addr ... Anyhow, your change looks good, I just have no idea whether updating "end" here is the right thing to do. -- Cheers, David